A theoretically calculated, automatically plotted, and photoreduced hologram has been successfully used to ``reconstruct'' the image of a nonexistent, three-dimensional, equilateral tetrahedron. The theory, as presented therein, provides a synthetic hologram which consists only of completely opaque and transparent portions; allows reconstruction of the entire image with any fraction of the hologram as in conventional experimental types; can be made to reconstruct objects for either on- or off-axis viewing; provides both a real and virtual image; and produces a positive image with both positive and negative prints.

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Performance data characterizing a direct optical activation device that operates either pneumatically or hydraulically are presented. This direct conversion device for optical signals offers immunity to electromagnetic interference and provides an alternative to electrooptic and electromechanical valves for actuation. The device uses a modified fluidic laminar proportional amplifier, employing laser induced deflection of the fluidic supply jet to perform the signal conversion. The pneumatic version operates at a supply pressure of 20.7 kPa having a gain of 15.5 kPa/W of optical power and a bandwidth of 140 Hz. The hydraulic version of the device operates with MIL-5606 hydraulic oil pressurized to a supply pressure of 1300 kPa. The hydraulic version has a gain of 170 kPa/W of input optical power and a bandwidth of 170 Hz. Experiments have determined that the laser induced deflection of the supply jet is a result of optical modulation of the fluid viscosity which creates an asymmetric jet flow.

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